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Post by radio on Sept 25, 2016 17:48:40 GMT -5
A gent i talked to at my shop last year brought in some large Petoskeys today. The larger one in the upper right is about 6 inches across and all seem pretty solid. Any hints on slabbing them? I have worked several smaller ones into cabs on the wheels, but never put one in a saw
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Post by manofglass on Sept 25, 2016 18:04:56 GMT -5
They cut easy just look for cracks
Walt
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Post by radio on Sept 25, 2016 18:08:32 GMT -5
They cut easy just look for cracks Walt The large one has a crack, but others look solid. Just wondering if they split or crumble once cut and if cutting in oil is ok?
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Post by Drummond Island Rocks on Sept 25, 2016 18:14:24 GMT -5
Nice. Hopefully they are good quality inside. I would not cut in oil. I only cut mine with water. This stuff is very soft and fairly porous so cleaning the oil off would be a pain.
Chuck
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Post by manofglass on Sept 25, 2016 18:19:25 GMT -5
I cut one the other day I didn't see any cracks On the outside it was full of cracks inside You just have to cut it to find out Hope you get some good slabs out of them
Walt
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Post by radio on Sept 25, 2016 18:29:28 GMT -5
Thanks all. My highest hopes are for the small one in left center. It is very heavy for it's size, so should be a good'un. The long, narrow one top left looks to be nice also.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,179
Member is Online
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Post by jamesp on Sept 26, 2016 6:03:34 GMT -5
They will be pieces of art soon.
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Post by Drummond Island Rocks on Sept 26, 2016 7:02:30 GMT -5
Cab size nodules are my favorite to work with. I have never had much luck with trying to make jewelry from the larger ones. The one at top left looks like it will make a cab or two if you just take a slice of the face that is showing.
Chuck
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Post by radio on Sept 26, 2016 16:04:25 GMT -5
Cut two slabs from the long narrow one toady on the trim saw and was surprised at how solid it was. One slab cracked, but otherwise they are solid and the "flowers" are not hollow in the center. I made two quick cabs this afternoon and they took a decent polish. Will try to get some pics tomorrow
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Post by Drummond Island Rocks on Sept 26, 2016 16:27:54 GMT -5
Zam on a muslin buff is the best final polish for Petoskey but be careful if it is pity or the polish will get stuck in nooks and crannies.
Chuck
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Post by radio on Sept 26, 2016 17:55:06 GMT -5
Zam on a muslin buff is the best final polish for Petoskey but be careful if it is pity or the polish will get stuck in nooks and crannies. Chuck Thanks Chuck Polished these on 14,000 diamond, but will try the Zam. I use it for the Silver and sometimes even Turquoise. A toothbrush with Dawn works pretty well, and usually finish off in an ultrasonic cleaner. When I used a leather wheel with cerium oxide, ultrasonic was the only thing to get all the residue out of any pits
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Post by toiv0 on Sept 26, 2016 18:55:00 GMT -5
I was at a rock show one time and bought some fossil coral from Missouri, the guy said it was the same as petosky but the other side of the shallow ocean. I bought a big chunk but it is lost or at the bottom of a pile, or at the bottom of a bucket or in a corner....anyway thats what he said. Never seen anyother material like that from MO.
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